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Republican presidential hopeful Rick Santorum says the United States should either commit to winning the war in Afghanistan or "get out."

Santorum tells ABC's "This Week" that he agrees with rival Newt Gingrich that a commitment to "winning" means recognizing the U.S. will stay in Afghanistan "to finish the job."

The former Pennsylvania senator says an effective U.S. role in the region may not mean the heavy military presence now in Afghanistan. He pointed to the few hundred U.S. troops that cleared the Taliban from local governments in some regions.

Santorum promises to work with experts in the area to determine troop strength and with the Afghan government to ensure its success.